VistaIOInsertAttr(3)


NAME

   VistaIOInsertAttr,   VistaIOAppendAttr,  VistaIOPrependAttr  -  add  an
   attribute to a list

SYNOPSIS

   void VistaIOInsertAttr (posn, after, name, dict, repn, value)
          VistaIOAttrListPosn *posn;
          VistaIOBoolean after;
          VistaIOStringConst name;
          VistaIODictEntry *dict;
          VistaIORepnKind repn;
          type value;

   void VistaIOAppendAttr (list, name, dict, repn, value)
          VistaIOAttrList list;
          VistaIOStringConst name;
          VistaIODictEntry *dict;
          VistaIORepnKind repn;
          type value;

   void VistaIOPrependAttr (list, name, dict, repn, value)
          VistaIOAttrList list;
          VistaIOStringConst name;
          VistaIODictEntry *dict;
          VistaIORepnKind repn;
          type value;

   where type is  VistaIOBit,  VistaIOUByte,  VistaIOSByte,  VistaIOShort,
   VistaIOLong,      VistaIOFloat,     VistaIODouble,     VistaIOAttrList,
   VistaIOBoolean,     VistaIOBundle,     VistaIOList,     VistaIOPointer,
   VistaIOString, VistaIOEdges, VistaIOImage, etc.

ARGUMENTS

   posn      Specifies   the  attribute  list  position  at  which  a  new
             attribute is to be inserted.

   after     Specifies whether a new attribute is to  be  inserted  before
             posn (FALSE) or after posn (TRUE).

   list      Specifies  the  attribute list to which a new attribute is to
             be appended or prepended.

   name      Specifies a name for the new attribute.

   dict      May specify a dictionary to be used in translating the  value
             supplied   to   a  keyword  that  should  be  stored  as  the
             attribute's value, or it may be NULL

   repn      Specifies the representation of the new attribute value.

   value     Specifies the new attribute value.

DESCRIPTION

   These routines provide three ways of  adding  a  new  attribute  to  an
   attribute list:

     * VistaIOInsertAttr  inserts  the new attribute immediately before or
       after the existing attribute specified by posn.

     * VistaIOAppendAttr places the new attribute at the end of list.

     * VistaIOPrependAttr places the new attribute  at  the  beginning  of
       list.

   With  the  dict argument you can provide a dictionary for mapping value
   to a keyword  that  will  be  stored  as  the  attribute's  value  (see
   VistaIOdictionary(3)). For example, if you pass an attribute value of 1
   and a dictionary that associates the value 1 with the keyword ubyte (as
   the  dictionaryVistaIORepnDict  does),  then  the  string ubyte will be
   stored as the attribute's value. Dictionaries may be used to  map  both
   numeric  values and strings to keywords. If you supply a dictionary but
   value is not mentioned in that dictionary, then value  itself  will  be
   stored with the attribute.

   If  value  is a number or a character string, the routine makes its own
   copy of the value as a character string for storing in  the  attribute.
   If, on the other hand, value is an attribute list, pointer, image, edge
   set, etc., then the routine stores a pointer in the  attribute  but  it
   does not make a copy of the object pointed to.

RETURN VALUES

   As  a side effect, these routines modify the attribute list referred to
   by list or posn.

SEE ALSO

   VistaIOSetAttr(3), VistaIOSetAttrValue(3),
   VistaIOattribute(3), VistaIOdictionary(3),

AUTHOR

   Art Pope <pope@cs.ubc.ca>

   Adaption to vistaio: Gert Wollny <gw.fossdev@gmail.com>





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